I've noticed a trend on my Shield TV since I have hooked it to a Vizio 50" 4k set (p502ui-b1). 1/3-1/2 of the time if the shield is asleep and I pick up the remote and press a button to wake it... I see the TV turn on, the shield green light shows on the unit, but the display never comes up. I have to unplug the HDMI cable and plug it back in to get it to display on screen. I have tried a few different HDMI cables and even tried different HDMI ports, tried changing to 1080p and so on. I'm not sure if it just something with this 4k set or what but didn't know if anyone else had seen this. I'd try this out for an extended time on my 60" Samsung but I don't feel like dragging it over to my fiancees house just yet lol